At SBL we do not have our own surveying capabilities. Instead we work in partnership with a number of high-profile surveying companies around the world, whether they use airborne, mobile or land-based survey capture techniques. Indeed we work with some partners who use a combination of all 3 and our data processing teams are sufficiently large, flexible and multi-disciplined to accommodate this. Similarly we are able to model data from either aerial or satellite imagery, or laser scanning such as Lidar.
Typically our survey partners capture the imagery or laser scans, pass the post-processed photographs or point clouds to us for feature extraction, and take delivery of our modelled data. Outputs include 2D attributed cross sections and Sc0 clearance files (especially for tunnels), 3D attributed wireframes, 3D Surface Models (DSM), 3D Terrain Models (DTM) and 3D building models (LOD 1, 2 and 3).
The data can be delivered in a wide range of file CAD or GIS file formats. In the case of our models from laser scans, these are typically delivered as single models that have the 2D cross sections and 3D DSM embedded in the 3D wireframe. This allows different disciplines within an organisation to access, use and modify the same version of the model at any given time – a crucial component of BIM compliance.